I live in wichita, KS, and whiles its not washington or northern california, we do have a small community of tree lovers living in one of the parks here. Theres 2 "camps", both hidden in the trees. Theyre about 50 ft from each other. about a quarter a mile away to the north is another "camp", and theres various other "camps/treefort attempts" strung through the rest of the area.
The park is on the very edge of town basically, and while it IS a public park, very few people come into the area the camps are located in. A 10 minute walk will get you to the closest gas station, and a 30 min walk will get you to a grocery store or whever the fuck else you wanna go. I "live" off and on at one of the camps, and at th every least visit it everyday to make sure no ones left it trashed.
The camps are both on the ground, and hidden deep within trees, and theyre virtually impossible to see, unless someone told you where they were at, so privacy and security isnt that big of a deal. The smaller camp has like some logs and shit to sit on, a small tarp covering it, a table....and some other miscellaneous crap. The bigger camp has 2 wooden chairs, a firepit, no roof but plenty of shade, and regular squatters.
To the best of my knowledge weve had no more than 9 people living together at once. The smaller camp is comfortable for 2- 3 people, while the bigger one is comfortable for around 5 to 10 people.
eitherway if anyone ever gets the camps goin in the west coast, id hella come out and join and help out.